Parking lock device and a drive assembly with a parking lock device

Abstract

The invention relates to a parking lock device (10) for a drive arrangement with features of claim 1 and a drive arrangement with such a parking lock device (10).

Description

State of the art

[0001] The invention relates to a parking lock device for a drive arrangement with features of claim 1 and a drive arrangement with such a parking lock device.

[0002] Parking lock devices are used to interrupt or release the torque transmission of a drive system. This enables a vehicle to be parked. The parking lock device typically includes a parking lock that can be actuated by a worm gear. The worm gear can be driven by an electric motor.

[0003] A disadvantage is that a separate electric motor is required to drive the worm gear. This increases the weight, cost, complexity, and required installation space of the parking lock system. Disclosure of the invention

[0004] According to the invention, a parking lock device for a drive assembly is proposed. The drive assembly comprises an electric coolant pump with a rotor shaft for conveying coolant. The rotor shaft is movable between a first position and a second position. The parking lock device includes a parking lock. The parking lock is configured to block and / or release torque transmission. The rotor shaft is coupled to the parking lock for activating and / or deactivating the parking lock. The parking lock device includes a chamber. The parking lock device is configured such that filling the chamber with coolant allows the rotor shaft to be moved into the second position.

[0005] This allows for a simpler, more cost-effective, lighter, and smaller parking lock mechanism. A separate drive, particularly a separate electric motor, for the parking lock is no longer required. Specifically, the rotor shaft can be moved into the second position using simple means, and the parking lock can be deactivated (driving mode function).

[0006] The coolant can also act as a lubricant. In other words, the coolant can serve both cooling and lubrication purposes. The coolant can be in the form of a liquid, particularly oil.

[0007] According to a further development of the parking lock device, the parking lock device can include a spring. The rotor shaft can be pre-tensioned into the first position by means of the spring.

[0008] This allows the rotor shaft to be moved into the first position and the parking lock activated (parking function) using simple means. An additional drive is not required.

[0009] According to a further development of the parking lock device, the parking lock device can include a coolant path fluidically coupled to the chamber. A valve can be arranged in the coolant path. The valve can be configured to move from a closed to an open position and / or vice versa. In the open position, coolant flow through the coolant path can be allowed by means of the valve. In the closed position, coolant flow through the coolant path can be blocked by means of the valve.

[0010] This allows the chamber to be filled with coolant using simple means.

[0011] In this context, a fluidic connection or fluidic coupling means that a liquid (fluid, in particular lubricant, e.g. oil) can flow between two fluidically coupled elements or between two elements in fluidic connection.

[0012] According to a further development of the parking lock device, the valve can be designed as a 2 / 2-way valve.

[0013] This allows the valve to be implemented using simple means.

[0014] According to a further development of the parking lock device, the parking lock device can include a pressure plate arranged on the rotor shaft. The parking lock device can be configured such that, when the chamber is filled, a hydraulic force is generated and exerted on the pressure plate, thus moving the rotor shaft into the second position.

[0015] This allows the rotor shaft to be moved into the second position and the parking lock to be deactivated using simple means. An additional drive is not required.

[0016] According to a further development of the parking lock device, the parking lock device can include at least one channel. The channel can be designed to drain coolant from the chamber. The channel can also be designed to drain coolant that seeps through or flows around the pressure plate.

[0017] This allows excess coolant to be drained from the parking lock mechanism using simple means.

[0018] According to a further development of the parking lock device, the parking lock can include a locking element. The locking element can be movable between a locked position and a released position. In the locked position, the parking lock can block torque transmission. In the released position, the parking lock can release torque transmission. The rotor shaft can be coupled to or interact with the locking element in such a way that movement of the rotor shaft into the first position moves the locking element into the locked position, and movement of the rotor shaft into the second position moves the locking element into the released position. Specifically, when the rotor shaft is in the first position, the locking element can be in the locked position. Specifically, when the rotor shaft is in the second position, the locking element can be in the released position.

[0019] This allows the parking lock to be activated (parking status function) and / or deactivated (driving status function) using simple means.

[0020] According to a further development of the parking lock device, the locking element can be arranged on a movable shaft. The shaft and the rotor shaft can be coupled, in particular connected, to each other by means of a connecting plate.

[0021] This allows the coupling between the rotor shaft and the parking lock to be implemented using simple means.

[0022] According to a further development of the parking lock device, the parking lock device can include a sensor device. The sensor device can be configured for position detection of the locking element and / or the connecting plate. The sensor device can be configured for optical detection, in particular as a camera.

[0023] This allows the status of the parking lock (activated or deactivated) to be monitored or checked using simple means.

[0024] According to the invention, a drive arrangement for a motor vehicle is proposed. The drive arrangement comprises a cooling circuit with a parking lock device as described above. The coolant pump of the parking lock device is configured to circulate coolant within the cooling circuit. In particular, the parking lock device is fluidically coupled to the cooling circuit.

[0025] Regarding the advantages achievable with the drive arrangement, reference is made to the relevant explanations concerning the parking lock device. The measures described in connection with the parking lock device and / or those explained below can be used for further development of the drive arrangement.

[0026] Embodiments of the invention are explained below with reference to the accompanying drawings. These show: Fig. 1 a schematic sectional view of a parking barrier device in a first position and Fig. 2 a schematic sectional view of the parking barrier device according to Fig. 1 in a second position.

[0027] In the following description and in the figures, corresponding components and elements bear the same reference symbols. For the sake of clarity, not all reference symbols are shown in every figure.

[0028] In the Fig. 1 and Fig. 2 The parking lock device as a whole bears the reference numeral 10. The parking lock device 10 is designed for a drive arrangement, in particular for a motor vehicle. The parking lock device 10 comprises an electric coolant pump 12 with a rotor shaft 14 for pumping a coolant.

[0029] A rotor 52 can be arranged on the rotor shaft 14 and can be driven by a stator 54. The rotor 52 and the stator 54 can be components of an electric machine 56 of the parking lock device 10 (or the coolant pump 12).

[0030] The coolant pump 12 can be designed as a gerotor 58 or comprise a gerotor 58.

[0031] The parking lock device 10 or the coolant pump 12 can include a first interface 60. The first interface 60 can be configured for introducing coolant into the parking lock device 10 or the coolant pump 12. The parking lock device 10 or the coolant pump 12 can include a second interface 62. The second interface 62 can be configured for discharging coolant from the parking lock device 10 or the coolant pump 12.

[0032] The parking lock device 10 or the coolant pump 12 can be connected to a cooling circuit 50 via the first interface 60 and / or via the second interface 62. The cooling circuit 50 is in the Fig. 1 and Fig. 2 is only shown schematically. The coolant pump 12 can be configured to pump coolant within the cooling circuit 50. The parking lock device 10 and the cooling circuit 50 can form components of a drive arrangement for a motor vehicle.

[0033] The parking lock device 10 includes a parking lock 20. The parking lock 20 is designed to block and / or release torque transmission. This allows, for example, the implementation of a parking function and / or a driving function of a motor vehicle's drive system.

[0034] The rotor shaft 14 is between a first position 16 (in Fig. 1 shown) and a second position 18 (in Fig. (2 shown) is designed to be movable. The rotor shaft 14 is coupled to the parking lock 20 in order to activate and / or deactivate the parking lock 20.

[0035] The parking lock device 10 comprises a chamber 22. The parking lock device 10 is designed such that by filling the chamber 22 with coolant, the rotor shaft 14 can be moved into the second position 18.

[0036] The parking lock device 10 can include a spring 24. The rotor shaft 14 can be pre-tensioned into the first position 16 by means of the spring 24.

[0037] The parking lock device 10 can include a coolant path 26 fluidically coupled to the chamber 22. The coolant path 26 can be configured as a channel or a bore within the parking lock device 10. A valve 28 can be arranged in the coolant path 26. The valve 28 can be configured to move from a closed position 13 to an open position 32 and / or vice versa. In the open position 32, coolant flow through the coolant path 26 is enabled by means of the valve 28. In the closed position 30, coolant flow through the coolant path 26 is blocked by means of the valve 28.

[0038] Valve 28 can be configured as a 2 / 2-way valve.

[0039] The parking lock device 10 can include a pressure plate 34 arranged on the rotor shaft 14. The parking lock device 10 can be configured such that, when the chamber 22 is filled, a hydraulic force is generated and exerted on the pressure plate 34, causing the rotor shaft 14 to move into the second position 18 (in Fig. The pressure plate 34 is moved (1 to the right). The pressure plate 34 can be arranged (movably) within the chamber 22. The pressure plate 34 can have a seal 35 on its outer circumference. The seal 35 can be designed as an O-ring.

[0040] The parking lock device 10 can include at least one channel 36. The channel 36 can be configured for draining coolant from chamber 22. The channel 36 can also be configured for draining coolant that leaks past the pressure plate 34 (or the seal 35).

[0041] The parking lock 20 can include a locking element 38. The locking element 38 can be conical in shape. The locking element 38 can be movable between a locking position 40 and a release position 42. In the locking position 40, the parking lock 20 can block torque transmission (parking lock 20 is activated). In the release position 42, the parking lock 20 can release torque transmission (parking lock 20 is deactivated). The rotor shaft 14 can be coupled to (or interact with) the locking element 38 such that movement of the rotor shaft 14 into the first position 16 moves the locking element 38 into the locking position 40 (parking function), and movement of the rotor shaft 14 moves the second position 18 of the locking element 38 into the release position 42 (driving function).

[0042] The locking element 38 can be arranged on a movable shaft 44. The shaft 44 and the rotor shaft 14 can be oriented parallel to each other. The shaft 44 and the rotor shaft 14 can be coupled, in particular connected, to each other by means of a connecting plate 46. The connecting plate 46 can be designed to receive the rotor shaft 14 and / or the shaft 44.

[0043] The connecting plate 46 is in the Fig. 1 and Fig. 2 only partially shown. Only a first section 45 of the connecting plate 46, which accommodates the shaft 44, and a second section 47 of the connecting plate 46, which accommodates the rotor shaft 14, are shown.

[0044] The parking lock 20 can comprise a parking lock wheel 64 and a pawl 66. The locking element 38 can be movably arranged on the shaft 44. The locking element 38 can be pre-tensioned by means of a further spring 68.

[0045] The latch 66 can be movably configured between a locking position 70 and an unlocking position 72. The latch 66 can, for example, be biased into the unlocking position 72 by means of a latch spring (not shown). In the locking position 70 (see figure 72), the latch 66 is in the locked position 70. Fig. 1) The pawl 66 engages the parking lock wheel 64 and prevents rotation of the parking lock wheel 64 (and thus torque transmission). In the unlocked position 72 (see below) Fig. 2) the latch 66 does not engage with the parking lock wheel 64, so that the parking lock wheel 64 is freely rotatable (and thus torque transmission is enabled).

[0046] The parking lock 20 can be configured such that, in the locked position 40 of the locking element 38, the locking element 38 (particularly due to its conical shape) forces the pawl 66 into the locked position 70. The parking lock 20 can also be configured such that, in the release position 42 of the locking element 38, the locking element 38 (particularly due to its conical shape) releases the pawl 66, which is then moved (e.g., due to the preload provided by the pawl spring) into the unlocked position 72. In other words, the parking lock 20 can be activated (torque transmission not possible) by moving the locking element 38 into the locked position 40 and deactivated (torque transmission possible) by moving the locking element 38 into the release position 42.

[0047] The parking lock device 10 can include a sensor device 48. The sensor device 48 can be configured for position detection of the locking element 38 and / or the connecting plate 46. The sensor device 48 can include an optical sensor, in particular a camera. The sensor device 48 is shown here only schematically.

[0048] The following will be based on the Fig. 1 and Fig. 2. The operation of the parking lock device 10 is explained. The coolant flow described in each case is shown in the Fig. 1 and Fig. 2 each indicated by arrows.

[0049] In Fig. In position 1, the valve 28 is arranged in the closed position 30. This prevents coolant flow through the coolant path 26 and thus prevents the chamber 22 from being filled. The coolant pump 12 delivers the coolant through the first interface 60, the gerotor 58, the second interface 62, and the cooling circuit 50. Due in particular to the preload provided by the spring 24, the rotor shaft 14 is arranged in the first position.

[0050] The latch 66 is in the locked position 70 and the locking element 38 is in the locked position 40. The parking lock 20 is activated. This allows the coolant to be pumped through the cooling circuit 50 by the coolant pump 12, with the parking lock 20 activated. This can correspond, for example, to a parked state of a vehicle with a drive system comprising the parking lock device 10 and the cooling circuit 50.

[0051] In Fig. In step 2, valve 28 is moved to the open position 32. The coolant pump 12 continues to circulate the coolant. Due to valve 28 being in the open position 32, the coolant is directed into chamber 22 via coolant path 26. Filling chamber 22 with coolant generates (hydrostatic) pressure in the chamber, which acts on pressure plate 34. In other words, a hydraulic force is generated that acts on pressure plate 34 and causes it to... Fig. 2 to the right. This moves the rotor shaft 14 into the second position 18. Due to the coupling between the rotor shaft 14 and the shaft 44 by means of the connecting plate 46, the movement of the rotor shaft 14 into the second position 18 causes the locking element 38 to move into the release position 42.

[0052] The pawl 66 is moved into the unlocked position 72, for example, by the preload of the pawl spring. The parking lock wheel 64 is released. Torque transmission is possible again. The parking lock 20 is thus deactivated. The coolant can then be pumped through the cooling circuit 50 by the coolant pump 12, with the parking lock 20 deactivated. This can correspond, for example, to a driving condition of a vehicle with a drive system comprising the parking lock device 10 and the cooling circuit 50.

[0053] By (re)moving the valve 28 to the closed position 30, the coolant flow into chamber 22 can be (again) interrupted. The coolant located in chamber 22 can escape from chamber 22, for example, through leaks and / or passages along the rotor shaft 14. Fig. 2 (indicated by second arrows along the rotor shaft 14). Due to the preload, the rotor shaft 14 is moved into the first position 16 by means of the spring 24. Moving the rotor shaft 14 into the first position 16 causes the locking element 38 to move into the locked position 40 and thus activates the parking lock 20 (see Figure 2). Fig. 1).

[0054] To (re)deactivate the parking lock 20, the valve 28 can (again) be moved to the open position 32, the chamber 22 filled with coolant, the rotor shaft 14 moved to the second position 18 and thus the parking lock 20 deactivated (see Fig. 2).

Claims

[1] Parking lock device (10) for a drive assembly comprising: - an electric coolant pump (12) with a rotor shaft (14) for pumping a coolant, wherein the rotor shaft (14) is designed to be movable between a first position (16) and a second position (18), - a parking lock (20) for blocking and / or releasing a torque transmission, wherein the rotor shaft (14) is coupled to the parking lock (20) for activating and / or deactivating the parking lock (20), - a chamber (22) wherein the parking lock device (10) is arranged such that by filling the chamber (22) with coolant the rotor shaft (14) can be moved into the second position (18). [2] Parking barrier device (10) according to claim 1, characterized by , that the parking lock device (10) comprises a spring (24), wherein the rotor shaft (14) is biased into the first position (16) by means of the spring (24). [3] Parking barrier device (10) according to claim 1 or 2, characterized by , that the parking lock device (10) comprises a coolant path (26) fluidically coupled to the chamber (22) in which a valve (28) is arranged, wherein the valve (28) is designed to be transferable from a closed position (30) to an open position (32) and / or vice versa, wherein in the open position (32) a coolant flow through the coolant path (26) is released, wherein in the closed position (30) a coolant flow through the coolant path (26) is blocked. [4] Parking barrier device (10) according to the preceding claim, characterized by , that the valve (28) is designed as a 2 / 2-way valve. [5] Parking barrier device (10) according to any of the preceding claims, characterized by, that the parking lock device (10) comprises a pressure disc (34) arranged on the rotor shaft (14), wherein the parking lock device (10) is configured such that when the chamber (22) is filled, a hydraulic force is generated and exerted on the pressure disc (34) so ​​that the rotor shaft (14) is moved into the second position (18). [6] Parking barrier device (10) according to any of the preceding claims, characterized by , that the parking lock device (10) has at least one channel (36) for draining coolant from the chamber (22) and / or coolant that seeps through at the pressure disc (34). [7] Parking barrier device (10) according to any of the preceding claims, characterized by, that the parking lock (20) comprises a locking element (38), wherein the locking element (38) is designed to be movable between a locking position (40) and a release position (42), wherein in the locking position (40) the parking lock (20) blocks a torque transmission, wherein in the release position (42) the parking lock (20) releases a torque transmission, wherein the rotor shaft (14) is coupled to the locking element (38) in such a way that a movement of the rotor shaft (14) into the first position (16) moves the locking element (38) into the locking position (40) and a movement of the rotor shaft (14) into the second position (18) moves the locking element (38) into the release position (42). [8] Parking barrier device (10) according to the preceding claim, characterized by , that the locking element (38) is arranged on a movable shaft (44), wherein the shaft (44) and the rotor shaft (14) are coupled to each other, in particular connected, by means of a connecting plate (46). [9] Parking barrier device (10) according to claim 7 or 8, characterized by , that the parking lock device (10) includes a sensor device (48) for position detection of the locking element (38) and / or the connecting plate (46). [10] Drive arrangement for a motor vehicle comprising a cooling circuit (50) with a parking lock device (10) according to one of the preceding claims, wherein the coolant pump (12) of the parking lock device (10) is configured to pump coolant within the cooling circuit (50).

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